Dynamical pressure (open) BC

[LasNikas]

Literature

https://doi.org/10.1063/5.0254575

based on #866

TODO

• Make it work with PST
• Make it work with EDAC

Open questions

• How handle the density in the transition boundary-fluid (set_particle_density!)? Is it better to calculate the inverse_state_eqaution?
• Impact of density diffusion in boundary zone (see stash: "revise and fix bugs")?
• Investigate the prescribed pressure term (second term eq. 13)
• Investigate the "smaller smoothing length"-TVF approach (http://dx.doi.org/10.1016/j.jcp.2017.02.016) and the scaled approach (https://www.sciencedirect.com/science/article/pii/S0021999125004863)

based on:
tbd

[LasNikas]

superseded by #871